Problem Local server lag

[khorozm]

I have a single player world which works just fine. Few of my friends started playing on it so I think let's make it into a server hosted in my computer instead. They haven't tested it out, but even for me I am getting some lag.
It looks like the server is sending me information about the world every half second, like the progress bars of machines updates every half second, mobs "teleport" a bit every half second.

Has anyone had the same trouble and managed to solve it?

 

[Gerald Huppertz]

So you have the server and your client running on the same PC?

PC specs? Ram, CPU, Video card, Hard drive.
What version of FTB?
What Java arguments have you added to the server start.bat?
What Java arguments do you have on the launcher?
How much ram have you allocated via the launcher?

 

[Connor Gavitt]

Also how fast is your internet (24mib/s? 10mib/s etc.) and is it fps lag or actual block/server related lag issues?
and how many things are running on your server?